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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2016 | Mar. 31, 2018 | Dec. 31, 2017
Surety Bond |  |  |
Debt Instrument [Line Items] |  |  |
Guarantee amount, maximum potential amount of payments |  | $ 14,927,000 | $ 13,980,000
Cash Collateralized Letter Of Credit - Spain Tax Audits |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount |  | 0 | 39,505,000
Non-Collateralized Surety Bond - UAM Brazil | Surety Bond |  |  |
Debt Instrument [Line Items] |  |  |
Guarantee amount, maximum potential amount of payments | $ 15,300,000 |  |
Cost of surety bond | $ 1,400,000 |  |
Guarantor obligation, term | P5Y |  |
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount |  | $ 136,700,000 | $ 136,900,000

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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